the amount of violent crime in those two cities is virtually identical. but if you look at the number of murders, it's ten times higher in seattle than it is in vancouver. what's the difference? the difference, very simply, is that in the united states, you can easily purchase guns. in canada, you cannot. we've lost two children to guns in this practice. both teenagers-- one was caught in a gun exchange over drug money. another was shot because she was dating someone's boyfriend at twelve. - drugs. - drugs. - alcohol. - alcohol. they very much increase the impulsive amounts of violent behavior as they are intended to be dis-inhibitors of ourselves. and so alcohol and drugs, cocaine in particular, is very provocative to violence. a lot of guys-- they are really fighting over the drugs now. they want to sell drugs because it's good way to make money. i think certainly drugs, gangs, these are predisposing factors. we know from the studies-- kids who take drugs, kids who are involved in gan, are more likely to be involved in violent acts. police officer: a lo